Low distortion filters for separating frequency or phase modulat

Details Low distortion filters for separating frequency or phase modulat Low distortion filters for separating frequency or phase modulat

1986-12-24

1988-05-24

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

358144, H04H 500

Patent

active

047471409

ABSTRACT:
A circuit for separating FM signals from a composite signal utilizes a comb filter having successive frequency response nulls which span the frequency spectrum of the FM signal to be separated. The comb filter response is phase linear and defines the pass-band of the desired signal. A nonideal or phase nonlinear bandpass filter can be cascaded with the comb filter to attenuate out of band signals. The cascade combination of the comb filter and nonlinear bandpass filters is a cost effective substitute for the conventional, complicated phase linear bandpass filter having a boxcar frequency response traditionally used to separate FM signals.

REFERENCES:
patent: 4072984 (1978-02-01), Kaiser
patent: 4329714 (1982-05-01), Pritchard
patent: 4547737 (1985-10-01), Gibson
patent: 4569072 (1986-02-01), van Roermund
L. B. Tyler et al, "A Companding System for Multichannel TV Sound", IEEE Trans. on Consumer Elec., vol. CE-30, No. 4, Nov. 84, pp. 633-640.

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